Operation Outside Amateur Bands - TM-11-5820-554-120027

(6) When receiving, leave the A.F. GAIN

TM 11 - 5820-554-12

control (5) set for a comfortable monitoring level,

(6) Set the OFF-ON-NB-CAL switch (1) to ON.

and adjust the receive level with the R.F. GAIN

The Collins KWM-2/2A is now ready for transmit

control (10). When the Collins KWM-2/2A is

operation in ssb service.

Speaking into the

receiving, the received signal is indicated in S-units.

microphone transfers from receive function to

The S-meter will read correctly with the R.F. GAIN

transmit function through the vox circuit action. If

control (10) at less than maximum setting, provided

the receiver is tuned to a different frequency, the

the received signal level is high enough to actuate the

transmitter is also tuned to this new receiver

S-meter. For example, if the R.F. GAIN control

frequency.

(10) is set for no-signal reading of S8 and reads S9

(7) After changing frequency, set the

with signal, the received signal is S9.

EMISSION switch (2) to LOCK and make the

d. Mobile Operation. The vox and antivox

following checks:

circuits will operate in mobile operation, but push-

(a) Set the meter switch (8) to grid.

to-talk operation is recommended, since high level

(b) Adjust the EXCITER TUNING control (6)

background noises will produce undesirable vox

slightly to check to see that the pa grid drive is

switchover. Set the VOX GAIN and ANTIVOX

peaked. If not, repeat a(10) above.

GAIN controls fully counterclockwise before

(c) Set the meter switch (8) to PLATE, and

installation. If vox operation is desired, leave

check the dip in plate current with the P.A.

clearance in installation so the top cover can be

TUNING control (7).

opened. For mobile operation, load the power

(d) Set the EMISSION switch (2) back to the

amplifier to 210 ma plate current. (In some

desired operating position.

installations, power amplifier plate current readings

c. Cw Operation.

less than 210 ma will be obtained due to cable

NOTE

length, cable size, and battery condition.)

The cw output signal is 1,750 Hz higher

3-13. Operation Outside Amateur Bands

than the dial reading. To set the cw output

signal frequency, subtract 1,760 Hz from

a. Selection of Crystals. The crystals supplied in

the desired output signal frequency. Set

Crystal Unit Set, Quartz CK-31/FRC-93 cover the

the crystal and vfo dial for the resultant

frequency ranges of 3.4 to 5.0 MHz and 6.5 to 30

output in cw operation.

MHz. Figure 3-6 shows crystal socket locations.

(1) Set the OFF-ON-NB-CAL (1) switch to ON.

Select these crystals as follows:

(2) Set up receiver and transmitter operation

(1) If the lower edge of the desired 200-kHz

according to paragraph 3-11 and a above, with

band is 11.8 MHz or less, the required frequency is

EMISSION switch (2) set to CW.

equal to the lower edge of the desired band plus

(3) Press the key and adjust the A.F. GAIN

3.155 MHz. For example, if the desired band is 4.0

control (5) for comfortable monitoring level.

to 4.2 MHz, 4.0 MHz plus 3.155 MHz equals 7.155

(4) Hold the key down and increase the VOX

MHz.

GAIN control setting until the vox relay operates.

(2) If the lower edge of the desired 200-kHz

To change the release time constant, adjust the VOX

band is 12.00 MHz or higher, the required

TIME

CONSTANT

potentiometer

(R43).

Clockwise rotation of this control increases the

release time. This control is located on a bracket

under the top cover, behind the meter.

(5) Set the meter switch (8) to ALC. While

sending a series of dots, adjust the MIC GAIN

control (4) for S3 meter reading of ALC.

NOTE

Component heating during operation may

cause the ALC reading to decrease.

Maintain the ALC reading at S3 by

Figure 3-6. Crystal socket locations

adjusting the MIC GAIN control (4) as

required.

3-11